Thirty-three species were recorded from various ornamental field plants, representing 23.08% of the native Polish scale insects fauna. These species belong to 6 families, namely: Asterolecaniidae, Coccidae, Diaspididae, Eriococcidae, Kermesidae and Pseudococcidae. The best represented families were the Diaspididae (13 species) and Coccidae (12 species). For each species, the type of habitats, host plants, pest status and zoogeographical region of origin are given. Scale insects were found on cultivated deciduous trees and shrubs (24 species) and on ornamental coniferous trees and shrubs (8 species) in parks, botanic and household gardens, housing settlements and along avenues. The most numerous and economically important species is Parthenolecanium corni, followed by Carulaspis juniperi and Leucaspis lowi. Special attention should be paid to invasive Pulvinaria floccifera on Ilex aquifolium (L.) and unidentified Parthenolecanium sp. on rhododendron plants. These scale insects were observed in massive density on their hosts and can survive the winter in Poland.

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